Question

Рассчитайте молярные массы следующих веществ: Mno2 КМno4., KCl, HNO3., н2SO4. Срочччччччно пожалуйста

Answer 1

Mno2 КМno4= 245 г/моль
KCl= 74 г/моль
HNO3=208 г/моль
н2SO4=98 г/моль

Answer 2

Calculating Molar Masses of Substances

To calculate the molar masses of the given substances, we can use the periodic table to find the atomic masses of each element and then sum them up according to the chemical formula.

1. Manganese Dioxide (MnO2) - Molar mass of Mn = 54.93804 g/mol - Molar mass of O = 15.999 g/mol - Calculating the molar mass of MnO2: - Molar mass = (1 * Mn) + (2 * O) = (1 * 54.93804) + (2 * 15.999) = 86.93608 g/mol [[1]].

2. Potassium Permanganate (KMnO4) - Molar mass of K = 39.0983 g/mol - Molar mass of Mn = 54.93804 g/mol - Molar mass of O = 15.999 g/mol - Calculating the molar mass of KMnO4: - Molar mass = (1 * K) + (1 * Mn) + (4 * O) = (1 * 39.0983) + (1 * 54.93804) + (4 * 15.999) = 158.034 g/mol [[2]].

3. Potassium Chloride (KCl) - Molar mass of K = 39.0983 g/mol - Molar mass of Cl = 35.453 g/mol - Calculating the molar mass of KCl: - Molar mass = (1 * K) + (1 * Cl) = (1 * 39.0983) + (1 * 35.453) = 74.5513 g/mol [[3]].

4. Nitric Acid (HNO3) - Molar mass of H = 1.00784 g/mol - Molar mass of N = 14.0067 g/mol - Molar mass of O = 15.999 g/mol - Calculating the molar mass of HNO3: - Molar mass = (1 * H) + (1 * N) + (3 * O) = (1 * 1.00784) + (1 * 14.0067) + (3 * 15.999) = 63.0129 g/mol [[4]].

5. Sulfuric Acid (H2SO4) - Molar mass of H = 1.00784 g/mol - Molar mass of S = 32.06 g/mol - Molar mass of O = 15.999 g/mol - Calculating the molar mass of H2SO4: - Molar mass = (2 * H) + (1 * S) + (4 * O) = (2 * 1.00784) + (1 * 32.06) + (4 * 15.999) = 98.079 g/mol [[5]].

Summary of Molar Masses:

- Manganese Dioxide (MnO2): 86.93608 g/mol - Potassium Permanganate (KMnO4): 158.034 g/mol - Potassium Chloride (KCl): 74.5513 g/mol - Nitric Acid (HNO3): 63.0129 g/mol - Sulfuric Acid (H2SO4): 98.079 g/mol

If you have any more questions or need further assistance, feel free to ask!